EP3658394A1 - Procede de gestion d'un circuit de climatisation inversible indirect de vehicule automobile - Google Patents
Procede de gestion d'un circuit de climatisation inversible indirect de vehicule automobileInfo
- Publication number
- EP3658394A1 EP3658394A1 EP18755872.1A EP18755872A EP3658394A1 EP 3658394 A1 EP3658394 A1 EP 3658394A1 EP 18755872 A EP18755872 A EP 18755872A EP 3658394 A1 EP3658394 A1 EP 3658394A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- heat transfer
- transfer fluid
- loop
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00899—Controlling the flow of liquid in a heat pump system
- B60H1/00914—Controlling the flow of liquid in a heat pump system where the flow direction of the refrigerant does not change and there is a bypass of the condenser
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H1/00899—Controlling the flow of liquid in a heat pump system
- B60H1/00921—Controlling the flow of liquid in a heat pump system where the flow direction of the refrigerant does not change and there is an extra subcondenser, e.g. in an air duct
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3205—Control means therefor
- B60H1/3213—Control means therefor for increasing the efficiency in a vehicle heat pump
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3228—Cooling devices using compression characterised by refrigerant circuit configurations
- B60H1/32281—Cooling devices using compression characterised by refrigerant circuit configurations comprising a single secondary circuit, e.g. at evaporator or condenser side
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3228—Cooling devices using compression characterised by refrigerant circuit configurations
- B60H1/32284—Cooling devices using compression characterised by refrigerant circuit configurations comprising two or more secondary circuits, e.g. at evaporator and condenser side
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/323—Cooling devices using compression characterised by comprising auxiliary or multiple systems, e.g. plurality of evaporators, or by involving auxiliary cooling devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H2001/00928—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices comprising a secondary circuit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
- B60H2001/00949—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices comprising additional heating/cooling sources, e.g. second evaporator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating devices
- B60H1/32—Cooling devices
- B60H2001/3236—Cooling devices information from a variable is obtained
- B60H2001/3255—Cooling devices information from a variable is obtained related to temperature
- B60H2001/326—Cooling devices information from a variable is obtained related to temperature of the refrigerant at a condensing unit
Definitions
- the invention relates to the field of motor vehicles and more particularly to a motor vehicle air conditioning circuit and its heat pump mode management method.
- a refrigerant fluid passes successively in a compressor, a first heat exchanger, called a condenser, placed in contact with an air flow outside the motor vehicle to release heat, a device and a second heat exchanger, called evaporator, placed in contact with a flow of air inside the motor vehicle to cool it.
- the air-conditioning circuit comprises two circulation loops of two distinct fluids (for example a refrigerant fluid on the one hand and glycol water on the other hand) in order to effect the various heat exchanges. .
- the air conditioning circuit thus comprises a first refrigerant fluid loop in which a refrigerant circulates, a second heat transfer fluid loop in which a heat transfer fluid circulates, and a bifluid heat exchanger arranged jointly on the first refrigerant loop and on the second heat transfer fluid loop, so as to allow heat exchange between said loops.
- Such an air conditioning circuit allows use according to different modes of operation, in particular in a simple dehumidification mode derived from the cooling mode and a total dehumidification mode derived from the heat pump mode. However, during these modes of operation, it is possible that the amount of heat energy generated is significant and therefore that the air flow into the passenger compartment is too hot and adversely affects the comfort of the occupants. This is particularly the case when the air conditioning circuit is also used to cool elements such as batteries, power electronics or one or more electric motors.
- One of the aims of the present invention is therefore to at least partially overcome the disadvantages of the prior art and to provide a method for managing an improved inverter cooling circuit, in particular in heat pump mode and heat pump dehumidification mode.
- the present invention therefore relates to a method for managing an invertible indirect air-conditioning circuit for a motor vehicle comprising a first refrigerant loop in which a refrigerant circulates and comprising a first two-fluid heat exchanger arranged jointly on the first refrigerant loop. and on a second heat transfer fluid loop in which a first heat transfer fluid circulates, the first bifluid heat exchanger being arranged so as to allow the exchange of heat between the first refrigerant loop and the second heat transfer fluid loop,
- the second heat transfer fluid loop comprising:
- said circuit being able to operate according to:
- a simple mode of dehumidification mode derived from a cooling mode in which the interior airflow (100) is cooled, and where the interior airflow (100) is cooled and then reheated before arriving in the cockpit, and
- a total dehumidification mode derived from a heat pump mode in which the interior airflow (100) is heated, and where the interior airflow (100) is cooled and then reheated before arriving in the cockpit, the indirect reversible air conditioning circuit comprising a central control unit connected to the temperature sensor of the first heat transfer fluid and able to control the redirection device of the first heat transfer fluid,
- the central control unit controls the redirection device of the first heat transfer fluid so that:
- the first heat transfer fluid is redirected both to the internal radiator and to the external radiator, in which T72t is a temperature setpoint value of the first heat transfer fluid at the temperature sensor and Yl a temperature differential between 0.5 and 5 ° C,
- the central control unit controls the redirection device of the first fluid so that the average temperature of the internal air flow at the outlet of the internal radiator is between 40 and 48 ° C.
- said central control unit determines the speed of the compressor so that the average temperature of the interior air flow at the outlet of the first heat exchanger is between 2 and 4 ° C.
- the first refrigerant fluid loop comprises a bypass line comprising a third expansion device disposed upstream of a second bifluid heat exchanger, said second bifluid heat exchanger being also arranged jointly on a secondary thermal management loop in which a second heat transfer fluid circulates, said bypass loop being disposed between a first junction point disposed downstream of the first bifluid heat exchanger, between said first two-fluid heat exchanger and the first expansion device and a second junction point disposed upstream compressor, between the third heat exchanger and said compressor.
- the central control unit determines the speed of the compressor also so that the average temperature of the second heat transfer fluid at the outlet of the second bifluid heat exchanger within the secondary heat management loop is included between 23 and 27 ° C.
- the second heat transfer fluid loop comprises:
- a first circulation pipe of the first heat transfer fluid comprising the inner heater and connecting a first connection point arranged downstream of the first bifluid heat exchanger and a second connection point disposed upstream of said first bifluid heat exchanger,
- a pump arranged downstream or upstream of the first two-fluid heat exchanger, between the first connection point and the second connection point.
- the device for redirecting the first heat transfer fluid comprises a second stop valve disposed on the second circulation line, the opening and closing of said second stop valve being controlled by the central control unit.
- FIG. 1 shows a schematic representation of an indirect invertible cooling circuit
- FIG. 2 shows an expansion device according to an alternative embodiment
- FIG. 3 shows a schematic representation of the second heat transfer fluid loop of the indirect reversible air conditioning circuit of FIG. 1, according to an alternative embodiment
- FIG. 4 shows a schematic representation of a heating, ventilation and / or air conditioning device
- FIGS. 5 to 8b show a schematic representation of the reversible air-conditioning circuit of FIG. 1 according to different modes of operation
- FIG. 9 shows a diagram of the opening or closing of the second shut-off valve as a function of the temperature of the first heat transfer fluid
- FIG. 10 shows a diagram of the variation of various parameters of the indirect reversible air conditioning circuit as a function of time.
- first element or second element as well as first parameter and second parameter or else first criterion and second criterion, etc.
- first criterion and second criterion etc.
- it is a simple indexing to differentiate and name elements or parameters or criteria close but not identical.
- This indexing does not imply a priority of one element, parameter or criterion with respect to another, and it is easy to interchange such denominations without departing from the scope of the present description.
- This indexing does not imply either an order in time for example to appreciate this or that criterion.
- FIG. 1 shows an indirect air conditioning circuit 1 for a motor vehicle.
- This indirect air conditioning circuit 1 comprises in particular:
- a first bifluid heat exchanger 5 arranged jointly on the first refrigerant fluid loop A and on the second heat transfer fluid loop B, so as to allow exchanges of heat between said first refrigerant fluid loop A and said second fluid loop; coolant B.
- the first refrigerant fluid loop A more particularly comprises in the direction of circulation of the refrigerant fluid:
- the bypass line 30 can more specifically connect a first connection point 31 and a second connection point 32.
- the first connection point 31 is preferably arranged, in the flow direction of the coolant, downstream of the first heat exchanger 9, between said first heat exchanger 9 and the second heat exchanger 13. More particularly, and as illustrated in FIG. 1, the first connection point 31 is arranged between the first heat exchanger 9 and the second expansion device 11. it is quite possible to imagine that the first connection point 31 is arranged between the second expansion device 11 and the second heat exchanger 13 as long as the refrigerant has the possibility of bypassing said second expansion device 11 or the cross without suffering loss of pressure.
- the second connection point 32 is, for its part, preferably located downstream of the second heat exchanger 13, between said heat exchanger 13 and the compressor 3.
- the latter comprises a first shut-off valve 33.
- the second expansion device 11 may include a stop function, that is to say it is able to block the flow of refrigerant when closed.
- An alternative may be to have a stop valve between the second expansion device 11 and the first connection point 31.
- Another alternative may also be to have a three-way valve at the first connection point 31.
- the first refrigerant fluid loop A may also comprise a non-return valve 23 disposed downstream of the second heat exchanger 13, between said second heat exchanger 13 and the second connection point 32 in order to prevent refrigerant fluid from the first bypass line 30 reflux to the second heat exchanger 13.
- the first refrigerant fluid loop A may also comprise a first internal heat exchanger (not shown) allowing a heat exchange between the high-pressure refrigerant fluid at the outlet of the first two-fluid heat exchanger 5 and the low-pressure refrigerant fluid at the outlet the second heat exchanger 13 or the bypass line 30.
- This first internal heat exchanger comprises in particular an inlet and a low pressure refrigerant output from the second connection point 32, and an inlet and an outlet high pressure refrigerant fluid from the first bifluid heat exchanger 5.
- high pressure refrigerant fluid is meant by a refrigerant fluid having undergone an increase in pressure at the compressor 3 and has not yet suffered pressure loss due to one of the expansion devices.
- coolant fluid at low pressure is meant by a coolant having undergone a loss of pressure and at a pressure close to that at the inlet of the compressor 3.
- the first refrigerant fluid loop A may furthermore also comprise a second internal heat exchanger (not shown) permitting a heat exchange between the high-pressure refrigerant at the outlet of the first internal heat exchanger and the circulating low-pressure refrigerant fluid. in the bypass line 30.
- This second internal heat exchanger comprises in particular a low-pressure refrigerant inlet and outlet from the first connection point 31, as well as a high-pressure refrigerant inlet and outlet. from the first internal heat exchanger.
- the second internal heat exchanger may be disposed downstream of the first stop valve 33.
- At least one of the first or second internal heat exchangers may be a coaxial heat exchanger, that is to say comprising two coaxial tubes and between which heat exchanges take place.
- the first internal heat exchanger may be a coaxial internal heat exchanger with a length of between 50 and 120 mm
- the second internal heat exchanger may be a coaxial internal heat exchanger with a length of between 200 and 700mm.
- the first coolant loop A may also comprise a desiccant bottle 14 disposed downstream of the first bifluid heat exchanger 5, more precisely between said first bifluid heat exchanger 5 and the first expansion device 7.
- a desiccant bottle 14 disposed on the high pressure side of the air conditioning circuit ie downstream of the two-fluid heat exchanger 5 and upstream of an expansion device, has a smaller footprint and a reduced cost compared to other solutions of phase separation as an accumulator which would be disposed of the low pressure side of the air conditioning circuit, that is to say upstream of the compressor 3, in particular upstream of the first internal heat exchanger.
- the first 7 and second 11 expansion devices may be electronic expansion valves, that is to say the pressure of the refrigerant output fluid is controlled by an actuator that sets the opening section of the expansion device, thereby fixing the pressure of the fluid output.
- Such an electronic expander is particularly adapted to let the refrigerant fluid without loss of pressure when said expansion device is fully open.
- the first expansion device 7 is an electronic expander controllable by a control unit integrated into the vehicle and the second expansion device 11 is a thermostatic expansion valve.
- the second expansion device 11 may in particular be a thermostatic expansion valve incorporating a stop function.
- said first 7 and second 11 expansion devices can be bypassed by a bypass line A ', including a stop valve 25, as shown in Figure 2.
- This bypass line A' allows the refrigerant to bypass said first 7 and second 11 devices relaxing without experiencing a loss of pressure.
- at least the second expansion device 11 is a thermostatic expansion valve comprising a bypass line A '.
- the first expansion device 7 may also include a stop function or may include a stop valve downstream to block or not the passage of the refrigerant.
- the first refrigerant fluid loop A also comprises a bypass line 80 of the first expansion device 7 and the first heat exchanger 9.
- This bypass line 80 comprises a third expansion device 12 arranged upstream of a second heat exchanger 83.
- This second bifluid heat exchanger 83 is also arranged jointly on a secondary thermal management loop.
- the secondary thermal management loop may more particularly be a loop in which circulates a second heat transfer fluid and connected to heat exchangers or cold plates at batteries and / or electronic elements.
- the third expansion device 12 may also include a stop function in order to allow the refrigerant to pass through the bypass line 80.
- An alternative is to have a stop valve on the second bypass line, upstream of the third expansion device 12.
- the bypass line 80 is connected on the one hand upstream of the first expansion device 7. This connection is made at a first junction point 81 disposed upstream of the first expansion device 7, between the first heat exchanger bifluid 5 and said first expansion device 7.
- the bypass line 80 is connected on the other hand at a second junction point 82 disposed upstream of the compressor 3, between the third exchanger 13 and said compressor 3.
- the second junction point 82 is disposed between the second connection point 32 of the bypass line 30 and the compressor 3.
- the second heat transfer fluid loop B may comprise:
- the first bifluid heat exchanger 5 The first bifluid heat exchanger 5,
- a first circulation pipe 50 of the first heat transfer fluid having an internal radiator 54 intended to be traversed by an interior air flow 100 to the motor vehicle, and connecting a first connection point 61 arranged downstream of the first heat exchanger 5 bifluid and a second connection point 62 disposed upstream of said first bifluid heat exchanger 5,
- a second circulation pipe 60 of the first heat transfer fluid having an external radiator 64 intended to be traversed by an external air flow 200 to the motor vehicle, and connecting the first connection point 61 arranged downstream of the first heat exchanger 5 bifluid and the second connection point 62 disposed upstream of said first bifluid heat exchanger 5, and
- a pump arranged downstream or upstream of the first heat exchanger two-fluid 5 between the first connection point 61 and the second connection point 62.
- the indirect reversible air conditioning circuit 1 comprises, within the second heat transfer fluid loop B, a device for redirecting the first heat transfer fluid from the first bifluid heat exchanger 5 to the first circulation pipe 50 and / or to the second heat pipe. circulation 60.
- said device for redirecting the first heat transfer fluid from the first bifluid heat exchanger 5 can in particular comprise a second stop valve 63 arranged on the second circulation pipe 60 in order to block or not the first fluid. coolant and prevent it from circulating in said second circulation pipe 60.
- the device for redirecting the first heat transfer fluid from the first bifluid heat exchanger 5 may in particular comprise
- a third shutoff valve 53 placed on the first circulation pipe 50 in order to block or not the first heat transfer fluid and prevent it from circulating in said first circulation pipe 50.
- the second heat transfer fluid loop B may also include an electric heating element 55 of the first heat transfer fluid.
- Said electric heating element 55 is in particular arranged, in the flow direction of the first heat transfer fluid, downstream of the first bifluid heat exchanger 5, between said first bifluid heat exchanger 5 and the first junction point 61.
- the internal radiator 54 and the first heat exchanger 9 are more particularly disposed within a heating, ventilation and / or air conditioning device 40.
- the heating, ventilation and / or air conditioning device 40 may comprise a supply line 41a with outside air and a supply line 41b in recirculated air (that is to say that comes from the passenger compartment). These two supply lines 41a and 41b both bring air to the first heat exchanger 9 so that it passes through.
- the heating, ventilation and / or air conditioning device 40 comprises a shutter 410a, for example a drum-type shutter, able to completely close or partially supply line 41a outside air or supply line 41b recirculated air.
- the heating, ventilation and / or air conditioning device 40 comprises a heating pipe 42a which makes it possible to supply air having passed through the first heat exchanger 9, at the level of the internal radiator 54 so that it the crossbar and is heated before arriving in a distribution chamber 43.
- This heating pipe 42a also comprises a shutter 420a shutter able to close completely or partially.
- the heating, ventilation and / or air conditioning device 40 may also comprise a bypass line 42b of the external radiator 54.
- This bypass line 42b allows the air passed through the first heat exchanger 9 to go directly into the distribution chamber 43, without passing through the internal radiator 54.
- This bypass 42b also comprises a shutter 420b shutter able to close completely or partially.
- the air can be sent to the windshield by an upper line 44a, the dashboard of the passenger compartment by a median pipe 44b and / or down the dashboard of the passenger compartment. cockpit by a lower pipe 44c.
- Each of these conduits 44a, 44b, 44c having a shutter 440 capable of closing completely or partially.
- the heating, ventilating and / or air conditioning device 40 also comprises a blower 46 for propelling the internal air flow 100.
- This blower 46 can disposed upstream of the first heat exchanger 9 in the direction of flow of the inner air flow 100.
- the indirect reversible air-conditioning circuit 1 comprises a central control unit 90 enabling it to switch from one mode of operation to another.
- the central control unit 90 is in particular connected to a temperature sensor 72 of the first heat transfer fluid disposed downstream of the first bifluid heat exchanger 5 and is able to control the redirection device of the first heat transfer fluid.
- the central control unit 90 is also connected to the second stop valve 63 and controls its opening and closing.
- the central control unit 90 can also be connected to the compressor 3 in order to control the speed of the latter.
- the central control unit 90 can also be connected to the various expansion devices 7, 11 and 12, in order to control their opening and thus define the pressure loss that the refrigerant undergoes when passing through them, to check whether they can be crossed. without loss of pressure or if they block the flow of refrigerant.
- the central control unit 90 can also be connected to different sensors, for example:
- the indirect reversible air conditioning circuit 1 described above can operate according to different modes of operation illustrated in Figures 5a, 5b, 6a and 6b. On these figures, only the elements and conduits in which circulate the coolant and the heat transfer fluid are shown.
- the first bifluid heat exchanger 5 in which the coolant transmits heat energy to the first heat transfer fluid circulating in the second heat transfer fluid loop B,
- the first expansion device 7 in which the coolant undergoes a loss of pressure and switches to low pressure
- the first heat exchanger 9 in which the coolant recovers heat energy by cooling the internal air flow 100, and
- the first shut-off valve 33 is opened and the second expansion device 11 is closed so as not to allow the refrigerant to pass.
- the first heat transfer fluid releases the heat energy obtained at the level of the first bifluid heat exchanger 5 in the outside air flow 200 at the external radiator 64.
- the second heat transfer fluid shutoff valve 63 is open.
- the first heat transfer fluid can pass through the internal radiator 54, however it is not crossed by the flow internal air 100, for example by closing the shutter 420a and by opening the shutter 420b shutter in the heating, ventilation and / or air conditioning 40.
- the third expansion device 12 is open (not shown), a portion of the high pressure refrigerant fluid at the outlet of the first bifluid heat exchanger 5 passes into the bypass line 80.
- the refrigerant fluid While passing through the third expansion device 12, the refrigerant fluid undergoes a loss of pressure and goes low pressure.
- the refrigerant then passes into the second bifluid heat exchanger 83 and recovers heat energy by cooling the second heat transfer fluid circulating in the secondary thermal management loop.
- the refrigerant then joins the compressor 3.
- the heat energy recovered from the secondary thermal management loop is discharged at the external radiator 64.
- This simple dehumidification mode is an operating mode derived from the cooling mode.
- This simple dehumidification mode differs from the cooling mode in that the first heat transfer fluid can evacuate heat energy also at the level of the internal radiator 54 in the interior air flow 100.
- the path of the coolant is identical to that of the cooling mode.
- the interior air flow 100 which passes through the inner radiator 54 is heated.
- the shutter 420a is open and the shutter 420b is closed in the heating, ventilation and / or air conditioning 40. Due to the cooling of the inner air flow 100 at the first heat exchanger 9 which allows the condensation of its humidity and then its heating at the internal radiator 54, said inner air flow 100 is dehumidified.
- the third expansion device 12 As before, if the third expansion device 12 is open, as shown in FIG. 6b, a part of the high-pressure refrigerant fluid leaving the first two-fluid heat exchanger 5 passes into the bypass line 80. While crossing the third expansion device 12 this refrigerant undergoes a loss of pressure and switches to low pressure. The refrigerant then passes into the second bifluid heat exchanger 83 and recovers heat energy by cooling the second heat transfer fluid circulating in the secondary thermal management loop. The refrigerant then joins the compressor 3. The heat energy recovered from the secondary thermal management loop is discharged at the external radiator 64 and the internal radiator 54.
- FIG. 7 shows a method of operation according to a heat pump mode in which the inner air flow 100 is heated, the heat energy heating the inner air flow 100 being recovered from the outside air flow 200.
- the refrigerant fluid successively passes into:
- the first expansion device 7 in which the coolant undergoes a first loss of pressure and goes to an intermediate pressure
- the second expansion device 11 in which the coolant undergoes a second loss of pressure and switches to low pressure
- the second heat exchanger 13 in which the fluid recovers heat energy by cooling the external air flow 200, before returning to the compressor 3.
- the first stop valve 33 is closed.
- the first heat transfer fluid releases the heat energy obtained at the level of the first bifluid heat exchanger 5 into the internal air flow 100 at the level of the internal radiator 54.
- the shutter 420a is open and the shutter 420b is closed.
- This heat pump mode is useful for heating the interior air flow 100 at both the first heat exchanger 9 and the internal radiator 54 by absorbing heat energy at the outside airflow 200 at the second heat exchanger heat exchanger 13.
- the electric heating element 55 may be in operation to provide additional heat energy input to the first heat transfer fluid to heat the interior airflow 100.
- the total dehumidification mode is a derivative of the heat pump mode.
- the interior air flow 100 is cooled and then reheated before arriving in the passenger compartment.
- This total dehumidification mode differs from the heat pump mode in that the refrigerant passes through the first expansion device 7 where it passes at low pressure and passes through the second expansion device 11 without loss of pressure. .
- the path of the coolant is identical to that of the heat pump mode, with the difference that the coolant undergoes only a single pressure loss at the first expansion device. 7.
- the refrigerant passes through the second expansion device 11 or bypasses it without loss of pressure.
- the refrigerant fluid thus passes successively in:
- the first bifluid heat exchanger 5 in which the coolant transmits heat energy to the first heat transfer fluid circulating in the second heat transfer fluid loop B,
- the first expansion device 7 in which the coolant undergoes a loss of pressure and switches to low pressure
- the first heat exchanger 9 in which the refrigerant recovers heat energy by cooling the internal air flow 100,
- the second expansion device 11 that the refrigerant passes through without loss of pressure
- the second heat exchanger 13 in which the fluid recovers heat energy by cooling the external air flow 200, before returning to the compressor 3.
- the interior air flow 100 which passes through the inner radiator 54 is heated.
- the shutter 420a is open and the shutter 420b is closed in the heating, ventilation and / or air conditioning 40.
- the third stop valve 63 is also open so that the first heat transfer fluid can also evacuate heat in the outside air flow 200 at the fourth heat exchanger 64.
- the first heat transfer fluid releases the heat energy obtained at the level of the first bifluid heat exchanger 5 into the internal air flow 100 at the level of the internal radiator 54.
- the shutter 420a is open and the shutter 420b is closed.
- the third expansion device 12 if the third expansion device 12 is open, a part of the high pressure refrigerant fluid leaving the first bifluid heat exchanger 5 passes into the bypass line 80. While passing through the third expansion device 12 this refrigerant undergoes a loss of pressure and switches to low pressure. The refrigerant then passes into the second bifluid heat exchanger 83 and recovers heat energy by cooling the second heat transfer fluid circulating in the secondary thermal management loop. The refrigerant then joins the compressor 3. The heat energy recovered from the secondary thermal management loop is discharged at the internal radiator 54.
- the present invention relates to a method for managing the indirect reversible air-conditioning circuit 1 when it operates in total or simple dehumidification mode mode, with or without passage of the refrigerant fluid in the second two-fluid heat exchanger 83.
- the central control unit 90 controls the redirection device of the first heat transfer fluid so that if the temperature measured at the temperature sensor 72 is greater than or equal to T72t + Yl, the first heat transfer fluid is redirected both to the internal radiator 54 and to the external radiator 64.
- T72t corresponds to a temperature setpoint value of the first heat transfer fluid at the temperature sensor 72 and Y1 is a temperature differential of between 0.5 and 5 ° C.
- Y2 is here a temperature differential between 0.5 and 2 ° C.
- the second stop valve 63 is opened and cyclically closed as illustrated in the diagram of FIG. 9 as a function of the temperature measured at the temperature sensor 72.
- the legend F corresponds to the closing of the second stop valve 63 and the legend O when it opens.
- the heat energy accumulated in the first heat transfer fluid is used only in part to heat the inner air flow 100 to a target temperature.
- the heat energy in excess is released into the outside air flow 200 at the external radiator 64.
- the outside temperature is such that it is low enough to require heating of the passenger compartment. but high enough to generate a lot of heat energy in total or simple dehumidification mode.
- Such a temperature may for example be an outside temperature of the order of 10 to 15 ° C.
- Another possibility that requires the evacuation of excess energy is when the branch loop 80 is open and additional heat energy from the secondary thermal management loop is added and transmitted to the first heat transfer fluid.
- the central control unit 90 controls the redirection device of the first fluid so that the internal air flow 100 at the outlet of the internal radiator 54 has an average temperature of between 40 and 48 ° C. This outlet temperature of the indoor airflow 100 is valid both in total or simple dehumidification mode.
- FIG. 10 shows the variation of various parameters of the indirect reversible air conditioning circuit 1 as a function of time during its operation in total dehumidification mode.
- the experimental parameters of this diagram are as follows:
- a second bifluid heat exchanger 83 delivering a thermal power of 2 kW to the cooling fluid
- the refrigerant fluid used in the first refrigerant loop A is R1234yf
- the curve T73 corresponds to the change in the temperature of the internal air flow 100 at the outlet of the first heat exchanger 9.
- the T54airo curve corresponds to the change in the temperature of the internal air flow 100 at the outlet of the internal radiator 54.
- the curve T54i corresponds to the evolution of the temperature of the first heat transfer fluid at the inlet of the internal radiator 54.
- the curve T83o corresponds to the evolution of the temperature of the second heat transfer fluid at the outlet of the second two-fluid heat exchanger 83.
- the curve Comp corresponds to the evolution of the speed of the compressor 3.
- the curve D5 corresponds to the evolution of the flow rate of the first heat transfer fluid within the first two-fluid heat exchanger 5.
- the curve D64 corresponds to the evolution of the flow rate of the first heat transfer fluid within the external radiator 64.
- the redirection of the first heat transfer fluid only to the internal radiator 54 or both to the internal radiator 54 and to the external radiator 64 is illustrated in the diagram of FIG. 10 by the variations in the flow rate of the first heat transfer fluid within the external radiator. 64 illustrated by curve D64. Each peak of the curve 64 thus corresponds to a point redirection of the first heat transfer fluid to the external radiator 64. Each peak of the curve 64 thus shows the opening and closing of the second stop valve 63.
- the point redirection of the first heat transfer fluid causes a variation of the flow rate of the first heat transfer fluid within the first bifluid heat exchanger 5, illustrated by the curve D5.
- the flow rate of the first heat transfer fluid within the first bifluid heat exchanger 5 first undergoes a point increase, which corresponds to an upward peak of the curve D5, followed by a point decrease, which corresponds to a peak up the curve D5, to return to an average rate, here of the order of 400 1 / h.
- the temperature of these parameters at the end of each peak is lower than they had before the peaks. Between each peak, these values increase substantially exponentially.
- the ad hoc redirection of the first heat transfer fluid to the external radiator 64 thus makes it possible to evacuate the excess heat and thus maintain the flow of internal air 100 at the outlet of the internal radiator 54 at an average temperature of between 40 and 48 ° C.
- the curve Comp corresponding to the evolution of the speed of the compressor 3, shows that at the time of each peak, the regime undergoes a sinusoidal variation.
- This determination of the speed of the compressor 3 by the central control unit 90 allows the internal air flow 100 at the outlet of the first heat exchanger 9 to be maintained at a temperature between 2 and 4 ° C., as illustrated by the curve T73.
- this determination of the speed of the compressor 3 allows the average temperature of the second heat transfer fluid at the outlet of the second bifluid heat exchanger 83 within the secondary thermal management loop to be between 23 and 27 ° C., as illustrated by FIG. curve T83o.
- This allows in particular cooled elements within the secondary thermal management loop not to be subjected to a second coolant having a too high temperature which could deteriorate, especially in heat pump dehumidification mode where the temperature of the refrigerant has tendency to increase exponentially if the excess heat energy is not removed.
- the method of management of the indirect reversible air conditioning circuit 1 allows, in total or simple dehumidification mode a specific evacuation surplus heat energy generated to ensure good comfort within the cabin of the motor vehicle. This is particularly the case when there is a second bifluid heat exchanger 5 supplying heat energy from the secondary thermal management loop.
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1757219A FR3069490B1 (fr) | 2017-07-28 | 2017-07-28 | Procede de gestion d’un circuit de climatisation inversible indirect de vehicule automobile |
| PCT/FR2018/051924 WO2019020954A1 (fr) | 2017-07-28 | 2018-07-26 | Procede de gestion d'un circuit de climatisation inversible indirect de vehicule automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3658394A1 true EP3658394A1 (fr) | 2020-06-03 |
| EP3658394B1 EP3658394B1 (fr) | 2021-06-09 |
Family
ID=59811648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18755872.1A Active EP3658394B1 (fr) | 2017-07-28 | 2018-07-26 | Procede de gestion d'un circuit de climatisation inversible indirect de vehicule automobile |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3658394B1 (fr) |
| CN (1) | CN111051092B (fr) |
| FR (1) | FR3069490B1 (fr) |
| WO (1) | WO2019020954A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3101020A1 (fr) * | 2019-09-24 | 2021-03-26 | Valeo Systemes Thermiques | Systeme de traitement thermique destine a un vehicule automobile |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003063236A (ja) * | 2001-08-27 | 2003-03-05 | Denso Corp | 車両用空調装置 |
| JP3841039B2 (ja) * | 2002-10-25 | 2006-11-01 | 株式会社デンソー | 車両用空調装置 |
| DE102012100525A1 (de) * | 2011-07-28 | 2013-01-31 | Visteon Global Technologies Inc. | Kraftfahrzeugkältemittelkreislauf mit einer Kälteanlagen- und einer Wärmepumpenschaltung |
| FR3013265B1 (fr) * | 2013-11-18 | 2017-02-17 | Valeo Systemes Thermiques | Systeme de conditionnement thermique d'un flux d'air pour vehicule automobile et installation de chauffage, ventilation et/ou climatisation correspondante |
| US9751381B2 (en) * | 2014-01-24 | 2017-09-05 | Ford Global Technologies, Llc | Method and system for vehicle climate control |
| FR3020129B1 (fr) * | 2014-04-16 | 2019-03-22 | Valeo Systemes Thermiques | Circuit de fluide frigorigene |
| FR3022852B1 (fr) * | 2014-06-27 | 2016-10-14 | Valeo Systemes Thermiques | Dispositif de gestion thermique de vehicule automobile et procede de pilotage correspondant |
| DE102014217960A1 (de) * | 2014-09-09 | 2016-03-10 | Bayerische Motoren Werke Aktiengesellschaft | Wärmepumpenanlage zur Klimatisierung eines Fahrzeuges und Verfahren zum Betrieb einer solchen Wärmepumpenanlage |
| FR3031576A1 (fr) * | 2015-01-12 | 2016-07-15 | Peugeot Citroen Automobiles Sa | Dispositif de thermoregulation d’un vehicule automobile |
-
2017
- 2017-07-28 FR FR1757219A patent/FR3069490B1/fr not_active Expired - Fee Related
-
2018
- 2018-07-26 CN CN201880057615.4A patent/CN111051092B/zh active Active
- 2018-07-26 WO PCT/FR2018/051924 patent/WO2019020954A1/fr not_active Ceased
- 2018-07-26 EP EP18755872.1A patent/EP3658394B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111051092A (zh) | 2020-04-21 |
| FR3069490A1 (fr) | 2019-02-01 |
| WO2019020954A1 (fr) | 2019-01-31 |
| CN111051092B (zh) | 2023-08-15 |
| EP3658394B1 (fr) | 2021-06-09 |
| FR3069490B1 (fr) | 2019-08-02 |
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